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Acute limb ischaemia (ALI) occurs when there is a sudden lack of blood flow to a limb within 14 days of symptoms onset. On the other hand, when the symptoms exceed 14 days, it is called critical limb ischemia (CLI). CLI is the end stage of peripheral vascular disease where there is still some collateral circulation that bring some blood flow to the distal parts of the limbs. While limbs in both acute and chronic limb ischemia may be pulseless, a chronically ischemic limb is typically warm and pink due to a well-developed collateral artery network and does not need emergency intervention to avoid limb loss, whereas ALI is a vascular emergency.

The Future History is a series of science fiction stories written by American author Robert A. Heinlein (1907–1988). It describes a projected future of the human race from the middle of the 20th century through the early 23rd century. The term Future History was coined by John W. Campbell Jr. in the February 1941 issue of Astounding Science Fiction. Campbell published an early draft of Heinlein's chart of the series in the May 1941 issue.